public void GetTextureData(int mipLevel, IntPtr destination, int storageSizeInBytes)
        {
            int width  = MipmapHelper.GetDimension(Width, mipLevel);
            int height = MipmapHelper.GetDimension(Height, mipLevel);

            D3DTexture2D stagingTexture = new D3DTexture2D(_device, new Texture2DDescription()
            {
                Width             = width,
                Height            = height,
                Usage             = ResourceUsage.Staging,
                BindFlags         = BindFlags.None,
                CpuAccessFlags    = CpuAccessFlags.Read,
                OptionFlags       = ResourceOptionFlags.None,
                MipLevels         = 1,
                ArraySize         = 1,
                SampleDescription = new SharpDX.DXGI.SampleDescription(1, 0),
                Format            = DeviceTexture.Description.Format
            });

            // Copy the data from the GPU to the staging texture.
            _device.ImmediateContext.CopySubresourceRegion(DeviceTexture, mipLevel, null, stagingTexture.DeviceTexture, 0);

            int elementCount = width * height;
            // Copy the data to the array.
            DataBox db = _device.ImmediateContext.MapSubresource(
                stagingTexture.DeviceTexture,
                0,
                MapMode.Read,
                MapFlags.None,
                out DataStream ds);

            int pixelSizeInBytes = D3DFormats.GetPixelSize(DeviceTexture.Description.Format);
            int rowSize          = pixelSizeInBytes * width;

            // If the pitch exactly matches the row size, we can simply copy all the data.
            if (rowSize == db.RowPitch)
            {
                SharpDX.Utilities.CopyMemory(destination, db.DataPointer, elementCount * pixelSizeInBytes);
            }
            else
            {
                // The texture data may not have a pitch exactly equal to the row width.
                // This means that the pixel data is not "tightly packed" into the buffer given
                // to us, and has empty data at the end of each row.

                for (int rowNumber = 0; rowNumber < height; rowNumber++)
                {
                    int rowStartOffsetInBytes = rowNumber * width * pixelSizeInBytes;
                    ds.Read(destination, rowStartOffsetInBytes, width * pixelSizeInBytes);

                    // At the end of the row, seek the stream to skip the extra filler data,
                    // which is equal to (RowPitch - RowSize) bytes.
                    ds.Seek(db.RowPitch - rowSize, SeekOrigin.Current);
                }
            }

            stagingTexture.Dispose();
        }
        private int GetRowPitch(int width)
        {
            var pixelSize = D3DFormats.GetPixelSize(DeviceTexture.Description.Format);

            return(pixelSize * width);
        }